Skip Navigation

Canon EF 2x III Extender

Multiplies select telephoto lens's focal-length by 2X

3 Reviews

Overview

Our take on the Canon EF 2x III Extender

Get some extra versatility from your telephoto L-Series lens with this precision-designed 2.0X extender. Your 300mm lens, for example, will double in reach, with a resulting focal length of 600mm (on full-frame cameras) or 960mm (on APS-C sensor cameras), once this extender has been placed in the light path. And it will only give up two stops of light sensitivity in the process. It's like getting two lenses out of your kit bag when this extender is standing at the ready.

Get some extra versatility from your telephoto L-Series lens with this precision-designed 2.0X extender. Your 300mm lens, for example, will double in reach, with a resulting focal length of 600mm (on full-frame cameras) or 960mm (on APS-C sensor cameras), once this extender has been placed in the light path. And it will only give up two stops of light sensitivity in the process. It's like getting two lenses out of your kit bag when this extender is standing at the ready.

A built-in microcomputer facilitates communication between lens, extender, and camera body, and provides fully integrated exposure and focus control on many Canon lenses. Not all lenses will be fully compatible though, so you should check your manuals and the Canon website to make sure of your lens's compatibility with this extender.

Fluorine coatings on the extender's optical elements will keep soils, smearing and fingerprints to a minimum. And it features rugged dustproof and water-resistant construction.

Excellent build and quality! Images are crisp and clean!

Starphotog, Alabama

What's in the Box:

  • Extender EF2x III lens adapter
  • Front body cover (installed)
  • Rear lens cap (installed)
  • Lens Case LP811
  • Quick Guide
  • Warranty Card

Product Highlights:

  • increases focal length by 2.0X on select Canon L-series telephoto lenses
    • example: a 300mm prime lens will have its reach doubled to 600mm while only losing two stops of sensitivity
    • multiply your lens's focal length by 2 to see the resulting focal length when this lens is placed in-line on a full frame camera
    • then multiply that result by 1.6 to see your effective focal length on Canon APS-C cameras
  • rugged dustproof and water-resistant construction
  • on-board microcomputer regulates communication between camera, extender, and lens
  • 9 elements in 5 groups
  • only compatible with select L-Series lenses; not all automatic functions will be accessible on all lenses, consult manuals and Canon's website for compatibility info
  • 2-7/8" (diameter) x 2-5/8" (length)
  • 11.5 ounces
  • warranty: 1 year
  • Our 60-day money-back guarantee
Reviews

Canon EF 2x III Extender Reviews

Average Customer Review:

3 Reviews

Superb

Written by: Canon Fan from Ohio on January 10, 2016

This is a superb extender which works flawlessly with the Canon prime telephoto and super telephoto lenses. I bought it to supplement my Canon 300 mm f/2.8 IS II lens to give me an effective 600 mm f/5.6. The combination is light enough to hand hold and WAY cheaper than the 600 mm f/4 prime alternative offered by Canon. I am extremely pleased with the extender; I honestly can't see any degradation in the image quality when used with a Canon 5 d mk III body. Everything is corner to corner crisp and sharp and I see absolutely no sign of any contrast reduction in the images. It will also work very well with the popular 70-200 f/2.8 IS II although there is a very slight reduction in sharpness at the 70 mm end of this lens combination; the 200 mm end image quality is extremely good. If you own any of the Canon "big white" prime telephoto lenses, this is definitely a worthwhile accessory.

Pros: Very cost effective way of increasing your telephoto reach. It's very light and compact.

Cons: Loss of two stops of light compared with the mated lens.

Excellent extender!

Written by: Starphotog from Alabama on October 4, 2015

Crutchfield Customer Review (What's this?)

Excellent build and quality! Images are crisp and clean!

Pros: Excellent build and image quality

Cons: Heavy- bulky

CANON 2X EXTENDER

Written by: JUNIOR from MUEFREESBORO, TN. on March 15, 2014

GREAT PRODUCT; CANON HAS DONE A GOOD JOB WITH THE QUALITY

Pros: ALL GOOD

Cons: NONE

Details

Hands-on research

What's in the box?

Download the Canon EF 2x III Extender manual

  • Extender EF2x III lens adapter
  • Front body cover (installed)
  • Rear lens cap (installed)
  • Lens Case LP811
  • Quick Guide
  • Warranty Card

Product Research

Features

Overview: The Canon Extender 2x III will extend the focal length of a lens by a factor or 2x. It has a standard Canon EF-mount, and is compatible with many L-series Canon EF lenses (see list below). It features 9 elements in 5 groups, and comes with a soft LP811 lens case.

Compatibility: The Extender 2x III is compatible with the following Canon lenses:

Compatible Lens Focal Length and Maximum Aperture
with EF2x III
EF135mm f/2L USM 270mm f/4
EF180mm f/3.5L Macro USM 360mm f/6.7
EF200mm f/2.8L USM 400mm f/5.6
EF200mm f/2.8L II USM 400mm f/5.6
EF200mm f/1.8L USM 400mm f/3.5
EF200mm f/2L IS USM 400mm f/4
EF300mm f/4L USM 600mm f/8
EF300mm f/4L IS USM 600mm f/8
EF300mm f/2.8L USM 600mm f/5.6
EF300mm f/2.8L IS USM 600mm f/5/6
EF400mm f/5.6L USM 800mm f/11
EF400mm f/4 DO IS USM 800mm f/8
EF400mm f/2.8L USM 800mm f/5.6
EF400mm f/2.8L II USM 800mm f/5.6
EF400mm f/2.8L IS USM 800mm f/5.6
EF500mm f/4.5L USM 1000mm f/9.5
EF500mm f/4.5L IS USM 1000mm f/8
EF600mm f/4L USM 1200mm f/8
EF600mm f/4L IS USM 1200mm f/8
EF800mm f/5.6L IS USM 1600mm f/11
EF100-400mm f/4.5-5.6L IS USM 200-800mm f/9.5-11
EF70-200mm f/4L USM 140-400mm f/8
EF70-200mm f/4L IS USM 140-400mm f/8
EF70-200mm f/2.8L USM 140-400mm f/5.6
EF70-200mm f/2.8L IS USM 140-400mm f/5.6
EF70-200mm f/2.8L IS II USM 140-400mm f/5.6
EF300mm f/2.8L IS II USM 600mm f/5.6
EF400mm f/2.8L IS II USM 800mm f/5.6
EF500mm f/4L IS II USM 1000mm f/8
EF600mm f/4L IS II USM 1200mm f/8
EF1200mm f/5.6L USM 2400mm f/11

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

Canon only canon [ tlfquincy  Apr 23, 2016 ]

Searches related to the Canon EF 2x III Extender Multiplies select telephoto lens's focal-length by 2X